Chi-square and Beyond for 2x2 Tables

10:00 am to 4:30 pm, 14 June 2019

This course aims to demystify the range of statistics that can be used to summarise the associations between two binary variables. We move on from the standard chi-square test to investigate other options that may yield more useful information.

Event Information

Open to

All

Availability

Yes

Cost

£125.00

Organiser

When data is collected from 2 binary variables on the same individuals or items, the data may be displayed as a 2 by 2 table. It is often of interest to determine whether there is some form of association between the two variables in the table, for example, comparing the % who test positive between two treatment groups, or between 2 subgroups such as males and females. The chi-square test is most commonly used by researchers to compare the percentage of individuals in two groups who share a trait.

However, there are many other statistics that may be applied to a 2x2 table to provide more useful information and this course aims to help guide the researcher through alternative analyses to decide on the most appropriate investigation of their data.

The following tests and concepts are covered in the course:

Fishers exact testing

Absolute Risk Reduction (ARR)

Proportions tests

Number needed to treat (NNT)

Relative risk (RR)

Attributable risk (AR)

Odds ratio (OR)

Kappa

Sensitivity and specificity

Positive and negative predictive values

Likelihood ratios

For each statistic we consider the interpretation and appropriate usages.

Cancellations

Please note that no refunds will be given for non-attendance or cancellations made within 5 working days of the start of the course. For delegates attending courses on funded places, a £50 fee will be charged for late cancellation, non-attendance or partial-attendance. This fee is needed to cover printing, catering, etc. costs that are ordered no later than 5 days before the course and are based on the number of people registered at that point in time.

“A really useful day. Just the right level for me and addressed some knowledge deficits. Lots to think about”

“Thank you very much, the course was indeed helpful!”

"I found this course extremely interesting and useful. It clarified many points of definitions and limitations of the different tests. I thought the practicals were essential and useful to consolidate the points learnt.”

"A great course, it brought together a lot of things, I didn't realise were connected.”

"The presenter was very good. It was good doing all the practicals to help understand the concepts.”